Central to Mountain time

Drive from Dallas toward the Colorado Rockies and the clock falls back an hour once you leave the Texas and Oklahoma panhandles, which are both on Central Time. Kansas City to Denver on Interstate 70 is about nine hours of driving, but you arrive only eight hours later by the clock. Coming home, the hour disappears again, which is worth remembering when you book a hotel check-in or a dinner reservation for the return day.

Flying is quicker: Dallas–Fort Worth to Denver takes roughly two hours, so a noon departure lands around 1:00 PM Mountain, and the Chicago–Denver flight is about two and a half hours.

Canada's prairies show the zones from another angle. Saskatchewan uses Central Standard Time (UTC−6) all year and never changes its clocks. Its neighbor Alberta uses Mountain Time with daylight saving, so in winter Calgary is one hour behind Regina, while in summer Calgary's MDT equals UTC−6 and both cities read the same time.

In the United States, Central and Mountain switch together on the second Sunday of March and the first Sunday of November, so Chicago–Denver stays fixed at one hour. Only Arizona and Saskatchewan break the pattern. For a full comparison of Central with Eastern instead, see CST to EST.